Molecular Interfacial Slip between Solid and Liquid in Polymer Suspensions of Hard Spheres

Inn, Yongwoo; Wang, S. Q.

doi:10.1021/la00005a029

Cited by 17 publications

(11 citation statements)

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“…A comparison of the curves of the treated and untreated filler composites in the 2nd run, where no more thinning due to agglomerate disintegration occurs, clearly shows this effect. The additional thinning can be attributed to interfacial slippage that occurs due to the decreased particlematrix interactions [4,39,41,42]. With increasing SSA of the particles as well as with increasing f, the interfacial slippage became more pronounced, leading to stronger shear thinning (Fig.…”

Section: Resultsmentioning

confidence: 99%

Effect of the particle size on the viscoelastic properties of filled polyethylene

Osman

Atallah

2006

Polymer

122

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Section: Resultsmentioning

confidence: 99%

Effect of the particle size on the viscoelastic properties of filled polyethylene

Osman

Atallah

2006

Polymer

122

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“…As the local shear rate increases with decreasing distance between the spheres, the local shear increases with volume fraction of the spheres and external shear. Although the exact value of the local shear rate has not been experimentally determined, it was estimated that the value of the local shear might be more than 20 times that of the external shear at a GB content of 28 vol % 37. This local shear was high enough to deform the several‐micrometer LCP droplets into long fibrils in the LCP dispersed composites, irrespective of the viscosity ratios 15, 16.…”

Section: Resultsmentioning

confidence: 99%

Suppressed coalescence of dispersed viscous poly(methyl methacrylate) phase in polystyrene matrix by glass beads

Chen

2008

J Polym Sci B Polym Phys

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The effect of glass beads (GB) on morphology of polystyrene (PS)/poly (methyl methacrylate) (PMMA) blends has been studied by scanning electron microscopy (SEM) at different shear rates and during quiescent annealing. For the viscosity ratio of PMMA to PS greater than unity, the dispersed viscous PMMA phase in the blend coalesced during the shear flow or quiescent annealing. However, the domain size of the PMMA phase decreased significantly under shear even though a small amount of GB was added. The PMMA domain size further decreased and the size distribution became narrower with increasing GB content. According to SEM images, the quiescent coalescence of the PMMA phase was effectively inhibited by adding large amounts of GB, and the breakup of PMMA domains in shear flow was greatly favored by the high local shear prevailed between GB.

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“…Such ball-bearing effect resulting from the particle rotation can be intensified at higher frequencies and shear rates as well as at higher filler loadings. , On the other hand, it is difficult to prove the slip between the polymer chains and nanoparticles (molecular interfacial slippage) by experiments under shearing condition. However, this interfacial slippage as the vector difference in surface velocities between the nanoparticle and polymer chain can induce a lower viscosity due to the lower friction between the surface of particles and surrounding polymer chains in comparison to the friction between polymer chains. , Noteworthy, the slippage at the interfaces between nanoparticles and matrix chains is quite different from the slippage among polymer chains in pure matrix. In addition, the molecular interfacial slippage can be enhanced in nanocomposites with very weak interactions between polymer chains and nanoparticles (noninteracting interfaces). , …”

Section: Discussionmentioning

confidence: 99%

Non-Einstein Rheology in Segmented Polyurethane Nanocomposites

2021

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To provide a fundamental understanding regarding the potential of nanoparticle-induced viscosity reduction in segmented block copolymer-based nanocomposites, the shear rheological behavior of segmented polyurethane/C60 nanocomposites (NPUs) was studied up to 2 wt % C60, and the results were complemented by several dynamic and structural probes. The same microstructural features and dynamical relaxations were revealed for each matrix (PU) and its corresponding NPUs in the absence of deformation, representing the lack of difference in their dynamical behaviors at all studied C60 content. Under shear, however, interesting changes in the terminal rheological properties of PUs were observed in the presence of a C60 nanofiller. An anomalous terminal shear viscosity (η0) reduction was found for microphase-mixed PUs at a low C60 content of up to 0.5 wt %. However, the microphase-mixed NPUs containing a higher C60 content as well as the microphase-separated NPUs showed a higher η0 than their matrices. Slippage at the polymer/C60 interfaces was suggested as a possible mechanism behind the viscosity reduction, which appeared controllable by the degree of microphase separation, the ratio of slip length to the nanoparticle size, and the stiffness of segments. Accordingly, an effective slip length, b eff, was considered as the key factor in controlling the observed noncontinuum effects regarding the nanoparticle-induced viscosity reduction in the microphase-mixed PUs. When most C60 nanoparticles of radius r are positioned on the hard segments (HSs) of microphase-mixed PUs, b eff/r > 1 can lead to viscosity reduction, while the localization of C60 in the vicinity of soft segments (SSs) increased the matrix’s η0. A semiuniversal curve was also found to roughly estimate the η0 values of various NPUs.

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Molecular Interfacial Slip between Solid and Liquid in Polymer Suspensions of Hard Spheres

Cited by 17 publications

References 0 publications

Effect of the particle size on the viscoelastic properties of filled polyethylene

Effect of the particle size on the viscoelastic properties of filled polyethylene

Suppressed coalescence of dispersed viscous poly(methyl methacrylate) phase in polystyrene matrix by glass beads

Non-Einstein Rheology in Segmented Polyurethane Nanocomposites

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